html, body {
    position: fixed;
    overflow: hidden;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    touch-action: none;
    -ms-touch-action: none;
}

#renderCanvas {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
}

#refreshButton {
    position: absolute;
    background: #3b789a;
    color: #fff;
    box-shadow: 0 5px 10px 0 #000;
    transition: box-shadow .1s ease-in-out;
    border-radius: 2px;
    border: none;
    display: inline-block;
    margin: .5em;
    padding: .5em 1em;
    font-size: 1.25em;
    text-transform: uppercase;
    text-decoration: none;
    left: 50%;
    transform: translateX(-50%);
    top: 25px;
}